In first crucial period of embryogenesis (5th -6th day) tunic of fertilization suddenly disappear. Embryo at this time was placed in uterine tube. What may it result in?

In first crucial period of embryogenesis (5^th -6^th day) tunic of fertilization suddenly disappear. Embryo at this time was placed in uterine tube. What may it result in?

1.  Embryo dying


2.  Invagination of blastocyst wall


3.  Blastocyst return to uterine tube ampule


4.  Appearance of two blastocysts


5.  *Implantation in uterine tube